12 November 1996 Progress in navigation-grade IFOG performance
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Abstract
We previously reported achievement of 0.0027 deg/rt-hr angle random walk, as well as attainment of 0.0092 deg/hr bias uncertainty, 9.2 ppm scale factor error and 0.38 arc-seconds input axis alignment error over the temperature range -55 to 71 degC under dynamic thermal environments. The gyro coil in these instruments has less than 3 inches outer diameter and less than one inch height. In this paper we report on further advances in navigation-grade IFOG technology achieved at Litton. The angle random walk has been reduced by a factor of three to 0.0009 deg/rt-hr. Bias uncertainty of 0.0081 deg/hr has been attained over the -55 to 71 degC temperature range having more stringent temperature ramps than previously reported. The gyro bias magnetic sensitivity has been reduced to 0.0002 deg/hr/gauss. This paper describes the IFOG optical architecture that utilizes a low-birefringence network and a polarization maintaining network, discusses the dominant sources of thermal and magnetically-induced bias error in the IFOG and presents the latest data from the navigation- grade IFOG.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Amado Cordova, Amado Cordova, Ralph A. Patterson, Ralph A. Patterson, John Rahn, John Rahn, Leo K. Lam, Leo K. Lam, David M. Rozelle, David M. Rozelle, "Progress in navigation-grade IFOG performance", Proc. SPIE 2837, Fiber Optic Gyros: 20th Anniversary Conference, (12 November 1996); doi: 10.1117/12.258181; https://doi.org/10.1117/12.258181
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